“I grew up not loving how I looked and felt held back because of it,” 18-year-old Sailor captioned a photo from her Sports Illustrated Swimsuit Issue photoshoot on Instagram Tuesday, “I don’t know why I always felt that way, sure I had baby fat and definitely went through a plethora of awkward phases, but I had a family that loved me I had friends who made me laugh etc. But for some reason I still looked in the mirror and always somehow found something to pick on.”

She continued, saying that she went from “too fat” to “too thin” to “too muscular” and was never satisfied with what she saw in the mirror, but that’s all in the past.

“Recently I have been liberated,” she wrote, adding, “I am healthy, I treat myself well, and for that I’m happy. I’ve looked in the mirror and been able to LOVE the things about my body that beauty norms deem ‘undesirable.’ I now have grown to know that my body is worthy of so many great things. I don’t need to be a size 0 to believe in myself. My body carries me each and every day, it loves the people I love, it holds what makes me healthy and strong, it bends it shakes it runs and it CHANGES. That is okay and that is beautiful.”

Brinkley, 63, and her daughters posed together for the highly-anticipated issue.

“This was a lesson in learning to let go, take the plunge, and embrace myself from both the inside AND out- which is something I struggle with each and every day,” she captioned a photo of herself in a bikini.

In another photo, the 31-year-old daughter of Billy Joel wrote, “I don’t have a completely flat tummy, or cellulite-free thighs … nor am I a model’s height or shape. Neither are hundreds of millions of other beautiful women out there. SO WHAT?”

She continued, “All of those unrealistic-looking, photoshopped images are nothing more than white noise, playing off of your own insecurities in order to make a buck. Don’t let them affect you. DO YOU! We are all perfect, just as we are.”